Russia's foreign ministry vowed on Saturday to react if the European Union (EU) implements new sanctions against Moscow over its role in the Ukraine crisis.

The EU announced the additional measures late on Friday but said they could be suspended if Moscow withdraws its troops from Ukraine and observes a newly agreed ceasefire in eastern Ukraine.

The new sanctions include adding a further 24 people to a list of people barred from entry to the 28-nation bloc and whose assets are frozen. They are due to be implemented on Monday.

"If they [new sanctions] are implemented of course there will be a reaction from our side," the ministry said in a statement.

Moscow criticised the EU for drawing up the tougher sanctions despite the truce agreed in Minsk that was appearing to hold in eastern Ukraine on Saturday.

By announcing the new sanctions, the EU's leadership "is practically sending a signal of direct support to the 'party of war' in Kiev, which is not happy with the results of the Minsk meeting," Russia's foreign ministry said.

"Instead of feverishly searching for ways to hurt the economies of its own countries and Russia, the European Union would do better to work on supporting the economic revival of the Donbass region" of eastern Ukraine, it added.